Spectial features of lattice dynamics and electron‐phonon interaction in Re

Abstract

The dynamic properties of the rhenium lattice are investigated using the methods of neutron and point-contact spectroscopy. Based on the double differential cross-sections of inelastic neutron scattering measured at 300 and 500 K the phonon spectra of rhenium are reconstructed with regard to the coherence effects. From the results of measurements of the second derivative of the current-voltage characteristic made in various Re point-contact, a mean point-contact function of electron-phonon interaction is obtained. The features of electron-phonon interaction function coincide within the experimental error with those of Re phonon spectrum on one and the same energy interval. Thus, the phonon spectrum participates entirely in the formation of the electronphonon interaction function.

Lattice dynamics and thermophysical properties of h.c.p. Re and Tc from the quasi‐harmonic approximation

“…The calculation was carried out at the equilibrium lattice parameters at 298 K. Experimental data are from Ref. at K (squares) and K (stars).…”

“…Phonon DOS data at two temperatures (295 and 495 K) are reported in Ref. and compared with the calculated results in Fig. .…”

“…These authors, however, did not compare their results with the experimental phonon frequencies in Ref. and did not calculate anharmonic quantities. The available experimental and theoretical data for Tc were reviewed by Rard et al .…”

“…Two experimental studies of Re phonon frequencies have been reported in the literature . Wakabayashi et al report phonon frequencies along the A direction, while Shitikov et al report the phonon density of states (DOS).…”

“…Phonon dispersions at different pressures (0, 50 and 100 GPa) were calculated in [20] in the harmonic approximation. These authors, however, did not compare their results with the experimental phonon frequencies in [4,5] and did not calculate anharmonic quantities. The available experimental and theoretical data for Tc were reviewed by Rard et al [21].…”